Lap desk



FIG. 1 is a perspective view of a lap desk showing my new design;

FIG. 2 is a front view thereof, with the rear view being a mirror image thereof;

FIG. 3 is a right side view thereof, with the left side view being a mirror image thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines in figures are for the purpose of illustrating portion of the lap desk and form no part of the claimed design. 

CLAIM The ornamental design for a lap desk, as shown and described. 